Hot deformation behavior of AA6005 modified with CaO-added Mg at high strains

Lee, Ji‐Woon; Son, Hyeon-Woo; Hyun, Soong‐Keun

doi:10.1016/j.jallcom.2018.09.255

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…This oxide film prevents the oxidation and ignition of the molten Mg, thereby alleviating the requirement for SF 6 , a harmful protective gas, during casting. Since CaO-added Mg possesses high oxidation resistance, it is utilized as a novel Mg additive that increases the melt cleanliness and accelerates the DRX of Al alloys during hot deformation [33,34].…”

Section: Discussionmentioning

confidence: 99%

Effect of CaO Addition on Microstructural Evolution Due to the Annealing of AZ31 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

Bae

Shin

Lee

et al. 2023

Metals

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This study demonstrated the application of equal-channel angular processing (ECAP), which was performed via the BC route, to determine the effect of the addition of CaO on the microstructural evolution of an AZ31 alloy due to annealing. Compression tests were performed to evaluate the mechanical properties of the alloy, and the corresponding microstructures were observed to elucidate the flow behavior. Ca-bearing second-phase particles were fragmented with the increase in the number of ECAP passes. The increase in the yield strength and flow stress with the addition of CaO was attributed to the dispersion of the Ca-bearing second-phase particles. When the CaO-added AZ31 and commercial AZ31 alloys were subjected to annealing, their flow stress decreased owing to the grain growth. However, the extent of the decrease in the flow stress for the CaO-added AZ31 alloy was lower than that for the commercial AZ31 alloy.

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Section: Discussionmentioning

confidence: 99%

Effect of CaO Addition on Microstructural Evolution Due to the Annealing of AZ31 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

Bae

Shin

Lee

et al. 2023

Metals

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“…DRX distribution maps and statistical maps of the specimens deformed at 950 • C and 0.01 s −1 with different true strains are illustrated in Figure 7. According to the reference [31][32][33][34], the dynamically recrystallized microstructure, substructure and deformed microstructure were characterized using the grain orientation spread (GOS) approach. As illustrated in Figure 7a-c, the dynamically recrystallized microstructure, substructure and deformed microstructure are marked as blue, yellow and red, respectively.…”

Section: Ebsd Analysis At Different True Strainsmentioning

confidence: 99%

Effect of Dynamic Recrystallization on the Transformed Ferrite Microstructures in HSLA Steel

Kingkam²,

Han

et al. 2020

Metals

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The flow stress behavior of high-strength low-alloy (HSLA) steel at different true strains was studied using a hot compression test. The effect of dynamic recrystallization (DRX) on the transformed ferrite microstructures was investigated with electron backscatter diffraction (EBSD). The EBSD analysis indicated that the fraction of high-angle grain boundaries (HAGBs) and DRX increased with increasing true strain. The low-angle grain boundaries (LAGBs) were gradually transformed into HAGBs with increasing DRX degree. When the true strain was increased to 0.916, the fraction of HAGBs increased to 85% and the fraction of DRX increased to 80.3%. The relatively high fraction of HAGBs was related to the complete DRX. The dislocations and substructures in the tested steel at different true strains were characterized by transmission electron microscopy (TEM). TEM observation shows that the nucleation of the dynamically recrystallized grains occurred by the bulging of the original grain boundaries. The DRX nucleation mechanism of the HSLA steel is the strain-induced grain boundary migration mechanism.

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“…It can be used in various extreme environments and widely used in the manufacture of various valves [1,2,3]. Its hot deformation behavior is an extremely complex dynamic process accompanied by changes in microstructure, including work hardening, grain growth, dynamic recrystallization and so on [4,5,6]. The flow stress is one of the important indexes for evaluating the deformation ability of metals.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel during High Temperature Deformation

Cai

et al. 2019

Materials

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The Gleeble-1500D thermal simulation test machine was used to conduct the isothermal compression test on 21-4N at the strain rate ( ε ˙ ) of 0.01–10 s−1, the deformation temperature (T) of 1273–1453 K and the maximum deformation is 0.916. The data of the stress-strain (σ-ε) were obtained. Based on the σ-ε data, the Johnson-Cook (J-C), modified J-C, Arrhenius and Back-Propagation Artificial Neural Network (BP-ANN) models were established. The accuracy of four models were verified, analyzed and compared. The results show that J-C model has a higher accuracy only under reference deformation conditions. When the deformation condition changes greatly, the accuracy of J-C model is significantly reduced. The coupling effect of T and ε ˙ of modified J-C model is considered, and the prediction accuracy is greatly improved The Arrhenius model introduces Zener-Hollomon (Z) to represent the coupling effect of T and ε ˙ , it has a fairly high prediction accuracy. And it can predict flow stress (σ) accurately at different conditions. The accuracy of BP-ANN model is the highest, but its learning rate is low, the learning and memory are unstable. It has no memory for the weights and thresholds of the completed training. So, there are certain limitations of it in use. Finally, a Finite Element Method (FEM) of the isothermal compression experiment for four models were established, and the distribution of the equivalent stress field, equivalent strain field and temperature field with the deformation degree of 60% were obtained.

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Hot deformation behavior of AA6005 modified with CaO-added Mg at high strains

Cited by 13 publications

References 33 publications

Effect of CaO Addition on Microstructural Evolution Due to the Annealing of AZ31 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

Effect of CaO Addition on Microstructural Evolution Due to the Annealing of AZ31 Alloys Processed by Equal-Channel Angular Pressing (ECAP)

Effect of Dynamic Recrystallization on the Transformed Ferrite Microstructures in HSLA Steel

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel during High Temperature Deformation

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